Is Supernatural’s Castiel Doomed After The Latest Big Death Reveal?

Is Supernatural’s Castiel Doomed After The Latest Big Death Reveal?

Then, in Sam's storyline, Chuck took Sam on a twisted version of It's A Wonderful Life, showing him the future if he and Dean were successful in trying to stop Chuck, with the goal of breaking Sam's sense of hope. In the future Sam saw, Castiel had gone mad after taking the Mark of Cain and was no longer around to help the Winchesters. In the present, Cas took the Mark because Dean couldn't do it again. Having the Mark of Cain is dangerous enough; throw in the future where Cas is absent, and possibly dead or doomed, and why shouldn't I worry?